CH9329 Serial Port to Standard USB HID Keyboard Mouse Device Module With Pin New | eBay
USB HID to UART, RS-485 Extension Board - ElectroDragon
USB Input module (HID)
Serial Port To Standard USB HID Keyboard And Mouse Device Module CH9329 Module supports both regular and multimedia keyboards - AliExpress
Human Interface Devices (HID)
Amazon.com: BRIMFORD USB Mini 4-Key Keypad, 2.4G Programming Macro Pad with Knobs, RGB Keypad for OSU HID Standard Keyboard, Hot-Keys One-Handed Mechanical Gaming Keyboard (4Key 2.4G) : Video Games
A Closer Look at HID Class
USB Made Simple - Part 5
Serial Port to Standard USB HID Keyboard and Mouse Device CH9329 Module DIY | eBay
USB HID Joysticks
Usb Hid | Hackaday
USB-IF Publishes HID Standard for Braille Displays | audioXpress